Inspect cooling system for leaks

AR20.00-P-1010MNB

Inspect cooling system for leaks

12.11.2018

Engine

178 in model 190

1

Cap

2

Coolant expansion reservoir

3

Tester cap

4

Pressure pump

 Warning

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

No parts of the body or limbs should be within the operating area when the components are moving.

AS00.00-Z-0011-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Switch on ignition

2

Adjust heater to maximum heat output

3

Unscrew cap (1) slowly on coolant expansion reservoir (2) and reduce overpressure

4

Check coolant level and antifreeze content coolant

 Coolant mixing ratio

*BF20.00-P-1001-04A

5

Screw tester cap (3) onto coolant expansion reservoir (2)

 Test cap

*210589009100

6

Connect pressure pump (4) at tester cap (3)

 Pressure pump

*124589242100

7

Apply a test pressure to the engine cooling system for 2 minutes


Do not exceed the specified test pressure.
Damage can occur on the engine cooling system otherwise.

 There should be no pressure loss within a period of 2 minutes.

Test pressure for pressure-testing the cooling system

*BE20.30-P-1002-01D



Check

8

Perform a visual inspection on the assembly parts carrying coolant

In the event of pressure loss

 Check condition and coolant loss for all assembly part carrying coolant and connections and remove coolant loss if necessary using suitable measures.



Install

9

Remove overpressure over the valve at the pressure pump (4) and remove pressure pump (4)

 Pressure pump

*124589242100

10

Unscrew tester cap (3) at coolant expansion reservoir (2).

 Test cap

*210589009100

11

Switch off ignition

12

Check coolant level and antifreeze content coolant

If necessary

 Coolant mixing ratio

*BF20.00-P-1001-04A

13

Screw cap (1) onto coolant expansion reservoir (2)

Cooling system check values

Number

Designation

Engine 178

BE20.30-P-1002-01D

Test pressure for pressure-testing the cooling system

Overpressure

bar

1,4

 Coolant mixing ratio

Number

Designation

Engine all (4xWD, CAR, smart)

BF20.00-P-1001-04A

Coolant mixing ratio

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Overview and specifications sheet

BB00.40-P-0310-01A

References to sheet specification

BB00.40-P-0310ZZ